Exchange Data between Python and C++

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  • Jethro689
    New Member
    • May 2015
    • 2
    #1

    Exchange Data between Python and C++

    I have just started learning programming. I have completed a number of tutorials with regards to Python Basics.

    I now want to exchange information between python and C++. For example. I have 2 numbers in python which I call a program written in C, which adds those 2 numbers and returns the result to python.

    Which is the simplest way to do this?
    Tags: None
    • computerfox
      Contributor
      • Mar 2010
      • 276
      #2
      Do you mean that you are getting the numbers by calling a C program from your Python code?
      If you are printing the numbers in the C code, you can probably write it to a temporary file, gather the data in the Python code, then remove the temporary file.

      Code:
      #!/bin/python
import os

os.system("./cprog > temp.txt");
raw_data=open("temp.txt").read();
os.system("rm temp.txt");
print raw_data;
      And you can make that work for other programs:
      Code:
      #!/bin/python
import os

def readc(cpath):
 os.system("'"+cpath+"' > temp.txt");
 raw_data=open("temp.txt").read();
 os.system("rm temp.txt");
 return raw_data;

print readc("cprog");
      404 Not Found
      http://safe.abelgancsos.com/codeposter/project.php?id=381


      404 Not Found
      http://safe.abelgancsos.com/codeposter/project.php?id=382

        Comment

        • Jethro689
          New Member
          • May 2015
          • 2
          #3
          Hi thanks for your response!

          I have already successfully tried this method of reading from a text file and even saving it to a different one. My problem and lack of understanding focuses on 2 points:

          1) How can i return the value to the python program
          2) how to directly send data between the 2 programs? I mean how to call the C++ function and send the arguments directly from the python program rather than having the function to read it from a text file?

          Thanks again for your help

            Comment

            • dwblas
              Recognized Expert Contributor
              • May 2008
              • 626
              #4
              There is not enough information here. You can use subprocess to run a program and supply command line arguments, as well as retrieve anything printed, but I don't know if that is what you mean. See Doug Hellmann's Python Module of the Week on subprocess to see if it is what you want to do http://pymotw.com/2/subprocess/index...ule-subprocess

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